You'll probably see more and more people listing these in custom groups as more guilds clear the content.

Double confirmed, got a couple last night through a premade group listing. Also seen a number of offers in trade chat for 500 - 2k gold per slot, along with the usual "get it before it's nerfed" *warnings*. Good news, though, is that each battle is nothing but dream whelplings, so decent shot of getting a blue quality one.